1、AECMA STANDARD NORME AECMA AECMA NORM Edition approved for publication 31 January 2005 prEN 3709 Edition P 2 January 2005 Comments should be sent within six months after the date of publication to AECMA-STAN PUBLISHED BY THE EUROPEAN ASSOCIATION OF AEROSPACE INDUSTRIES - STANDARDIZATION d%k? - The w
2、rench or the socket shall be free from crack; - The general surface condition shall comply with the requirements of 4.2.1; - The distortion of the socket and wrench outer diameter shall not exceed 0,05 mm; - The permanent distortion on the wrench handle shall not exceed 5“; - A Rockwell hardness tes
3、t shall show values complying with the values specified in the product standard. 4.4 Dimensions and geometric tolerances Dimensions and tolerances shall be as specified in the product standard. 5 Test methods 5.1 Test equipment The wrenches are fitted on a hexagonal test mandrel 2) whose nominal dim
4、ensions shall be equal to the dimensions of the corresponding wrench; machining tolerance h8, minimum hardness 55 HRC. Dimensions and shapes to IS0 4095. 1 1 1 (COS 30) - (G) H = % nominal dim. H = 0,0597 hexagon nominal dim. Key 1 The wrench teeth shall not seat on this part of the mandrel Figure 1
5、 -Test equipment 2) The mandrel is secured to a fixture or a calibrated torquemeter Page 5 prEN 3709:2005 7 8 5.2 Test of wrenches 40 27 51 34 The wrenches shall be fully engaged on the mandrel. During the test, they shall be handled smoothly and without shaking movements. 12 14 The load is applied
6、(as far as possible) on the wrench body normal to the centreline, continuously and progressively until a torsional torque corresponding to the tested wrench is obtained. 165 110 248 155 5.3 Test of socket 19 22 The insertion of the socket on the mandrel shall be equal to 0,55 IISM (where “S“ is the
7、nominal dimension across flat of the mandrel or of bolt considered) and shall be performed without induced resistance. The socket shall be manually extracted without the contribution of any external tooling. The socket is driven using a square mandrel with a minimum hardness of 55 HRC. The nominal d
8、imension across flat of this mandrel shall be equal to the maximum dimension of the square drive corresponding to IS0 1174, tolerance h8. 630 31 5 800 400 5.4 Test performance The endurance torques specified in Table 1 and Table 2 shall be applied in both directions 1 O00 times. Cadence 60 by minute
9、 maximum. An integrity torque of 13 times the endurance torque shall be applied every 250th time. In the case of wrenches each end shall be tested. Table 1 - Test torques for flat, offset and modified offset double-hex box wrenches Dimension across flat Integrity torque Nm Endurance torque Nm I 6 I
10、30 I 20 I 9 I 75 I 50 I 10 I 105 I 70 I 11 I 132 I 88 I 17 I 440 I 235 Page 6 prEN 3709:2005 Table 2 - Test torque for socket wrenches I CODE 063 1 O0 125 Dimension across flat Endurance and Endurance and Endurance and integrity torques integrity torques integrity torques Nm Nm Nm 5 I 15 I23 I I 6 I
11、 20 I 29 I I 7 I 27 I40 I 27 I40 I 8 34 I51 34 I51 - I I I 9 I 50 I 75 I 50 I 75 I 10 - 771115 771115 11 - 93 I140 93 I 140 12 I I 133 1200 I 133 I 200 13 I I 186 I280 I 186 I 280 14 I I I 240 I 360 15 I I I 300 1450 I I I 360 1540 - - 16 17 I I I 400 1600 18 - - 433 1650 19 - - 453 1680 20 I I I 45
12、3 1680 21 I I I 453 1680 22 I I I 453 1680 6 Qualification and acceptance requirements 6.1 Qualification 6.1.1 Purpose Purpose of qualification tests is to ensure that, the wrench andlor socket design and manufacturing conditions allow the wrenches or sockets to comply with the requirements of this
13、standard. 6.1.2 Qualification procedure EN 9133: Requirement for IS0 9000:2000 not applicable. 6.1.3 Conditions Qualification inspection and tests specified in this document, shall be carried out on each type and size combination for wrenches and on each socket size and drive size according to Table
14、 3 and Table 4. All or part of these tests may also be performed for production acceptance, when a reinforced inspection seems to be necessary. Page 7 prEN 3709:2005 Qualification Clause I Sample size 6.2 Acceptance Production acceptance Clause I Samplesize Acceptance tests shall be performed on wre
15、nches or sockets randomly sampled from different manufacturing lots according to Table 5 and Table 6. Surface condition and appearance Surface coating 7 Marking, labelling and packaging 7.1 Marking The marking shall be as specified in the product standard. 7.2 Packaging All wrenches and sockets shal
16、l be packed by manufacturers option. 4-2-1 5 4-2-1 Table 5 4-2-2 2 - - Table 3 - Summary of test qualification and production acceptance Type of test Type of test Clause 1 2 3 4 5 Surface coating Inner profile of teeth I 4-4 I 5 I 4-4 I Table5 Dimensions and geometrical tolerances - X X - X X - 4-2-
17、2 - 4-2-3 - - I I Mechanical properties I 4-3 4 I - - Marking 7- 1 X X X X X Inner profile of teeth I 4-2-3 I 2 I 4-2-3 I Table5 Test methods I 5 I 5 I 5 I Table6 I I Marking I 7- 1 5 I - - Table 4 - Qualification testing for each dimensions samples Dimension and geometrical tolerances Mechanical pr
18、operties I 4-3 1x1-IXIXIX 4-2-1 I X I X I X I X I X Surface condition and appearance Test methods I 5 IXIXIXIXIX Page 8 prEN 3709:2005 up to 20 21 to50 Table 5 - Sampling plan for visual inspections and dimensional characteristics - - 3 5 O 90 Batch size Above 151 Acceptance number (Ac) and limiting
19、 quality (LQ) in accordance with the acceptable quality level (AQL) Sample size 12 2 80 I Ac I LQio % Batch size up to 20 21 to40 41 to81 81 to 120 Above 121 Sample size Destructive test Wrench Socket O O O O 1 1 1 1 2 2 I 51 to90 I 8 I O I 90 I 91 to 150 I 10 I 1 I 90 Table 6 - Sampling plans for the inspection of torque tests NOTE been performed. The wrench or socket to be subjected to destructive tests may be those on which non destructive tests have
